layer | R Documentation |
A layer is a combination of data, stat and geom with a potential position
adjustment. Usually layers are created using geom_*
or stat_*
calls but it can also be created directly using this function.
layer(
geom = NULL,
stat = NULL,
data = NULL,
mapping = NULL,
position = NULL,
params = list(),
inherit.aes = TRUE,
check.aes = TRUE,
check.param = TRUE,
show.legend = NA,
key_glyph = NULL,
layer_class = Layer
)
geom |
The geometric object to use to display the data, either as a
|
stat |
The statistical transformation to use on the data for this
layer, either as a |
data |
The data to be displayed in this layer. There are three options: If A A |
mapping |
Set of aesthetic mappings created by |
position |
Position adjustment, either as a string naming the adjustment
(e.g. |
params |
Additional parameters to the |
inherit.aes |
If |
check.aes, check.param |
If |
show.legend |
logical. Should this layer be included in the legends?
|
key_glyph |
A legend key drawing function or a string providing the
function name minus the |
layer_class |
The type of layer object to be constructued. This is intended for ggplot2 internal use only. |
# geom calls are just a short cut for layer
ggplot(mpg, aes(displ, hwy)) + geom_point()
# shortcut for
ggplot(mpg, aes(displ, hwy)) +
layer(
geom = "point", stat = "identity", position = "identity",
params = list(na.rm = FALSE)
)
# use a function as data to plot a subset of global data
ggplot(mpg, aes(displ, hwy)) +
layer(
geom = "point", stat = "identity", position = "identity",
data = head, params = list(na.rm = FALSE)
)
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